Ability to use Android Beam or NFC technology to invite guests into sessions or transfer sessions

User Story:

"Two techs are sitting at airport and one tech is looking at a machine. Tech two asks what is going on. So tech one "waves" or "taps" the other techs device and now he is on the same session."

"I'm on a meeting on my phone listening to stuff or watching slides. Keith walks up and asks what is going on. I tap his phone and now he is in the meeting."